On Tuesday morning, South Korea's benchmark Kospi index touched 7,999.67 points, brushing against the psychologically critical 8,000 mark for the first time in history. By the afternoon, it had cratered to 7,421.71, a 5.1% intraday collapse that wiped out billions in market value and sent shockwaves through global AI stocks.

The trigger: a Facebook post by Kim Yong-beom, South Korea's presidential chief of staff for policy, proposing that the nation pay every citizen a "dividend" funded by taxing AI profits from chipmakers like Samsung Electronics and SK hynix.

One Facebook Post, $3.8 Billion in Foreign Selling

"The gains from the AI era are not the result of a few specific companies, but were built on an industrial foundation that the entire nation has collectively developed over the past half-century," Kim wrote. "A portion of those gains should be structurally returned to all citizens."

The reaction was immediate and brutal. Foreign investors unloaded 5.6 trillion won ($3.8 billion) of Korean shares in a single session, according to Korea Herald data. Institutional investors added another 1.21 trillion won in net selling. Retail investors bought 6.68 trillion won on the dip, but it was nowhere near enough to absorb the outflows.

Samsung Electronics and SK hynix, the two companies that have driven South Korea's AI supercycle, both touched fresh all-time highs in early trading before reversing hard. Samsung closed at 279,000 won (down 2.28%) and SK hynix at 1.835 million won (down 2.39%). Both stocks had been on historic runs fueled by insatiable global demand for AI memory chips.

The Clarification Wasn't Enough

Kim later clarified that he meant using excess tax revenue generated by AI industry growth, not imposing a direct windfall tax on corporate profits. The presidential office also distanced itself from his remarks. But the damage was done. The Kospi only partially recovered, closing at 7,643.15 (down 2.29% for the session).

Bloomberg noted that growing concerns have been building in Korea around calls for AI industry leaders to share more of the boom's gains. A Samsung Electronics strike and broader labor tensions in the semiconductor sector have added fuel to the populist pressure.

The Selloff Went Global

The Korea crash was the opening act. By the time Wall Street opened, the AI stock pullback had spread across continents. Intel slumped 6.8% after tripling year-to-date. Micron Technology dropped 3.6% following a 180% gain in 2026. CoreWeave sank 6.1%, cutting into its 60% year-to-date rally. The Nasdaq composite fell 0.7% from its all-time high set the previous day.

Germany's DAX dropped 1.6% and France's CAC 40 fell 0.9%, making them some of the sharpest declines globally. Rising oil prices from the ongoing Iran conflict added another layer of pressure, with Brent crude climbing 3.4% to $107.77 per barrel.

Why This Matters Beyond One Bad Day

This wasn't just a garden-variety profit-taking session. It was the first time a government official in a major AI economy publicly proposed redistributing AI-generated corporate wealth to citizens. That's a fundamentally different threat model than regulation or antitrust.

If the idea gains traction beyond one policy adviser's Facebook post, it poses a direct challenge to the thesis underpinning AI chip valuations globally. Samsung and SK hynix don't just supply Korea. They supply the world. Any structural tax on their AI profits ripples through the entire supply chain, from NVIDIA's data center revenue to hyperscaler capex budgets in Virginia and Oregon.

The speed of the selloff also reveals something about the fragility of the current AI rally. Stocks that triple or gain 180% in five months are priced for perfection. A single populist Facebook post from a mid-level policy adviser was enough to trigger the worst day in Korean AI stocks this year.

Watch for copycats. If a Korean proposal can move global markets this violently, similar proposals in the EU, Japan, or Taiwan would be seismic. The AI wealth redistribution debate just moved from academic conferences to trading floors.

First reported by Bloomberg and Korea Herald. Market data via AP.